r5f21368xkfp Renesas Electronics Corporation., r5f21368xkfp Datasheet - Page 21

• Manufacturer Part Number: r5f21368xkfp
• Description: R8c/36w Group, R8c/36x Group, R8c/36y Group, R8c/36z Group Renesas Mcu
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36W Group, R8C/36X Group, R8C/36Y Group, R8C/36Z Group
REJ03B0315-0010 Rev.0.10
May 17, 2010
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.8.6
R0 is a 16-bit register for transfer, arithmetic, and logic operations. The same applies to R1 to R3. R0 can be split
into high-order bits (R0H) and low-order bits (R0L) to be used separately as 8-bit data registers. R1H and R1L are
analogous to R0H and R0L. R2 can be combined with R0 and used as a 32-bit data register (R2R0). R3R1 is
analogous to R2R0.
A0 is a 16-bit register for address register indirect addressing and address register relative addressing. It is also
used for transfer, arithmetic, and logic operations. A1 is analogous to A0. A1 can be combined with A0 and as a 32-
bit address register (A1A0).
FB is a 16-bit register for FB relative addressing.
INTB is a 20-bit register that indicates the start address of an interrupt vector table.
PC is 20 bits wide and indicates the address of the next instruction to be executed.
The stack pointers (SP), USP, and ISP, are each 16 bits wide. The U flag of FLG is used to switch between
USP and ISP.
SB is a 16-bit register for SB relative addressing.
FLG is an 11-bit register indicating the CPU state.
The C flag retains carry, borrow, or shift-out bits that have been generated by the arithmetic and logic unit.
The D flag is for debugging only. Set it to 0.
The Z flag is set to 1 when an arithmetic operation results in 0; otherwise to 0.
The S flag is set to 1 when an arithmetic operation results in a negative value; otherwise to 0.
Register bank 0 is selected when the B flag is 0. Register bank 1 is selected when this flag is set to 1.
The O flag is set to 1 when an operation results in an overflow; otherwise to 0.
Data Registers (R0, R1, R2, and R3)
Address Registers (A0 and A1)
Frame Base Register (FB)
Interrupt Table Register (INTB)
Program Counter (PC)
User Stack Pointer (USP) and Interrupt Stack Pointer (ISP)
Static Base Register (SB)
Flag Register (FLG)
Carry Flag (C)
Debug Flag (D)
Zero Flag (Z)
Sign Flag (S)
Register Bank Select Flag (B)
Overflow Flag (O)
Preliminary document
Specifications in this document are tentative and subject to change.
2. Central Processing Unit (CPU)
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